Improvement in furnaces for melting steel,heating boilers,gc



2 Sheets--She'et 14 P. W. lVlACKENZlE. Improvement in Furnaces for Melting Steel, Heating Boilers, &c.

Patented Sep. l0, i872.

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P. W. MACKENZIE. A Improvement in Furnaces for Melting Steel, Heating Boilers, &c."

Patented Sep. 10, 1872.

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/bzefms the melting-floor of the furnace.

UNITED vS'rlrrns .wenn @Errori PHILIP W. MACKENZIE, OF BLAUVELTVILLE, NEW YORK.

IMPROVEMENTIN FURNACES FOR MELTING' STEL,HEATING B`O|LERS,&c.

Specification forming part of Letters Patent No. 131',2S7,`dated September 10, 1872; antcdated September er like refractory material, for use in connection with a hot blast, the same combining durability with cheapness and efficiency. The invention also consists in anovel arrangement of ilues for heating the air by the ues which carry off the gaseous products of combustion, and for conducting it as hot-blast to the furnace, whereby a high degree ofheatis obtained for the blast Without impairing the draft.

Figure 1 represents a pla'n 'of .a furnace for casting steel, constructed in accordance with my invention; Fig. 2, a horizontal section of the same through the combustion-chambers; and Fig. 3, a vertical transverse section thereof through said chambers.

A A are the combustion-chambers, and B (l C are the ash-pits. l) l) represent pots in which the steel may be melted, if preferred to melt in pots. E is the opening in the top of the furnace for inserting and removing said pots, the same being closed after thepots are inserted.

The grates, which are shown as inclined, but may be horizontal, are composed of any number of grate-bars-two, F F, to each grate, being here represented. Thesel grate-bars are each constructed of a series of slabs, I) b, of

fire-brick, fire-clay, 4or other like refractory material, formed with bosses c c on them to leave air-spaces d d for the draft in between the slabs and to protect the bolts e e, which, conjointly With end plates f f, clamp or hold the several slabs together. Said slabs are of a shape so that, when arranged and united as shown and described, they form a grate-bar, F, having two or more, preferably three, equal sides, which bar is supported by a central shaft, g, that provides for the turning of the grate-bar by means of `a crank or Wrench applied to the outside end of said shaft for the purpose `of changing the sides of the grate under exposure to the fire, as wear renders necessary. In some cases the bolts e e and vbosses c c may be dispensed with and enlarged central bosses, receiving the shaft gthrough them, be substituted. By the construction of said grate-bars of fire-clay, or like refractory material, they are capable of resisting the action of a hot blast without choking, as do Water-grates, and Without losing any of the heat imparted to them, but confining the same to the combustion-chamber.

The fuel is applied to the grates F F automatically from hoppers or bunkers Gr G by feed-tubes H H, arranged to pass through Water-jackets I I, which latter have steam-pipes h h for carrying olf the steam as generated inthe jackets, and for conducting it to the ashpits C G to assist the draft. J J are doors for introducing the kindling to light the fires, or for adjusting, if necessary, the fuel on the grates, and K K are the ash-pit doors. The combustion-chambers are constructed mainly for burning bituminous or semibituminous coal 5 but I do not restrict myself to any particular kindof fuel. The gaseous products of combustion from the chambers A A, after performing their duty on the metal in the melting-chamber, or in the pots on the iloor B thereof, pass oft' by a series of horizontal flues, L L, to an uptake, M. side by side, and their dividing-Walls formed With longitudinal air-fines N N, open in the rear, for the admission of air which is heated by radiation from the walls of the smoke-dues, and which passes by a short Clipline, O, at the forward ends of the liues N- N, into side flues P P that open at their ends in the ash-pits to supply the latter with hot blast, and that have vertical fines Q Q connected with them to pass a portion of the heated air or hot blast coming from the rear of the furnace into hot-air distributing-chambers or ilues R R arranged immediately over -the combustion chambers. From these hot-air chambers orflues the heated air is passed or distributed by apertures or These fines are arranged radiation from the escaping gaseous products of combustion is supplied both above and below the grate, thus materially contributing to material7 with draft-passages through it, orbetween the slabs of which it is composed, subi stantially as specified.

2. The arrangement of the draft-nues L and the air-flues N O P Q R, and distributing apertures s, in combination with combustion-charnber A and. its ash-pit C, substantially as herein set forth.

I. W. MACKENZIE. Witnesses:

FRED. HAYNES, FEED. TUsoH. 

